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/* SPDX-FileCopyrightText: 2026 Project Tick
* SPDX-FileContributor: Project Tick
* SPDX-License-Identifier: GPL-3.0-or-later
*
* MeshMC - A Custom Launcher for Minecraft
* Copyright (C) 2026 Project Tick
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <https://www.gnu.org/licenses/>.
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright 2013-2021 MultiMC Contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "classfile.h"
#include "classparser.h"
#include <QFile>
#include <archive.h>
#include <archive_entry.h>
#include <QDebug>
namespace classparser
{
QString GetMinecraftJarVersion(QString jarName)
{
QString version;
// check if minecraft.jar exists
QFile jar(jarName);
if (!jar.exists())
return version;
// open jar with libarchive
struct archive* a = archive_read_new();
archive_read_support_format_zip(a);
if (archive_read_open_filename(a, jarName.toUtf8().constData(),
10240) != ARCHIVE_OK) {
archive_read_free(a);
return version;
}
// find and read Minecraft.class
QByteArray classData;
struct archive_entry* entry;
while (archive_read_next_header(a, &entry) == ARCHIVE_OK) {
QString name = QString::fromUtf8(archive_entry_pathname(entry));
if (name == "net/minecraft/client/Minecraft.class") {
la_int64_t sz = archive_entry_size(entry);
if (sz > 0) {
classData.resize(sz);
archive_read_data(a, classData.data(), sz);
} else {
char buf[8192];
la_ssize_t r;
while ((r = archive_read_data(a, buf, sizeof(buf))) > 0)
classData.append(buf, r);
}
break;
}
archive_read_data_skip(a);
}
archive_read_free(a);
if (classData.isEmpty())
return version;
// parse Minecraft.class
try {
char* temp = classData.data();
qint64 size = classData.size();
java::classfile MinecraftClass(temp, size);
java::constant_pool constants = MinecraftClass.constants;
for (java::constant_pool::container_type::const_iterator iter =
constants.begin();
iter != constants.end(); iter++) {
const java::constant& constant = *iter;
if (constant.type != java::constant_type_t::j_string_data)
continue;
const std::string& str = constant.str_data;
qDebug() << QString::fromStdString(str);
if (str.compare(0, 20, "Minecraft Minecraft ") == 0) {
version = str.substr(20).data();
break;
}
}
} catch (const java::classfile_exception&) {
}
return version;
}
} // namespace classparser
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